13. If the physical size of a charge particle is very small,
compared to the separation distance between them, it is called __________.

(Zero charge, Point charge, Positive charge, Negative charge)

14. “The magnitude of the electrostatic force between two point
charges is directly proportional to the product of the magnitude of the charges
and inversely proportional to the square of the distance between them.” It is
called __________.

1. The net charge flowing across the sectional area per unit time
is known as __________.

(Electric Current, Ampere, Electric flow, none of these)

2. The direction of electric current is that in which __________.

(Negative charge will drift, Positive charge will drift, Both
positive and negative charge will drift, None of these)

3. Mathematically Electric current I in a conductor is defined by
the relation __________.

(I = Qt, Q = I/t, I = Q/t, None of these)

4. The SI unit of current is __________.

(Ampere, Coulomb, volt, None of these)

5. 1A = __________.

(1C/s, 1C/s2, 1J/s, 1N/s)

6. “In a electrical circuit, the potential difference across a
conductor is directly proportional to the current flowing through it, provided
the temperature of the conductor remains the same.” This is called __________.

(Ohm’s Law, Coulomb’s Law, Guass’s Law, None of these)

7. Mathematically Ohm’s Law is written as __________.

(V = IR V = I/R, V = Qt, None of the above)

8. Measure of the opposition to the flow the free electron is
known as __________.

(Current, Resistance, Conductance, Capacitance)

9. The SI unit of electrical resistance is __________.

(Ampere, Volt, Farad, Ohm)

10. If the potential difference of 1 volt is applied across the
end of a conductor and the resulting current flowing through the conductor is
one ampere then the resistance of the conductor is said to be __________.

(1ohm, 1ampere, 1farad, 1volt)

11. 1W (ohm) = __________.

(1VA, 1V/A, 1C/A, 1J/A2)

12. It is experimentally observed that in general the resistance R
of a given wire increases with increase in __________.

(Temperature, Cross-section area of a wire, Length of a wire, none
of these)

13. It is experimentally observed that in general the resistance R
of a given wire decreases with increase in __________.

(Temperature, Cross-section Area, Length of a wire, None of the
above)

14. The change in resistivity per unit original resistivity (or resistance)
per degree change in temperature is called __________.

(Resistance, Conductance, Temperature coefficient of resistivity,
All of these)

15. The resistivity of a class of elements of some critical
temperature T, falls to zero. The materials showing such property are called
__________.

(Semi-conductors, Super-conductors, Insulators, Conductors)

16. The device which can maintain a potential difference between
two points to which they are attached are known as __________.

3. When electron in hydrogen atom jumps from higher orbit into
first orbit. The set of lines emitted is called __________.

(Balmer Series, Lyman Series, Bracket Series, Paschen Series)

4. When an electron in hydrogen atom jumps from higher orbit into
second orbit. The set of lines emitted is called __________.

(Balmer Series, Lyman Series, Bracket Series, Paschen Series)

5. When an electron in hydrogen atom jumps from higher orbit into
third orbit. The set of lines emitted is called __________.

(Balmer Series, Lyman Series, Bracket Series, Paschen Series)

6. When an electron in hydrogen atom jumps from higher orbit into
fourth orbit. The set of lines emitted is called __________.

(Balmer Series, Lyman Series, Bracket Series, Paschen Series)

7. When an electron in hydrogen atom jumps from higher orbit into
fifth orbit. The set of lines emitted is called __________.

(Balmer Series, Lyman Series, Pfund Series, Paschen Series)

8. __________ of the following series in the spectrum of the
hydrogen lies in the visible region of the electromagnetic spectrum.

(Paschen Series, Balmer Series, Lyman Series, Brackett sEries)

9. __________ of the following is not a fundamental postulate of
Bohr’s theory of hydrogen atom.

(The classical theory does not apply in the case of tiny particles
such as electrons, The electron in a stable orbitdoes not radiate energy, The
electron can move in all possible orbits, An atom radiates energy only when an
electron jumps from an allowed orbit of higher energy En to one of the lower
energ Ep)

10. __________ of the following is not a fundamental postulate of
Bohr’s theory of hydrogen atom.

(The total energy of the electron in one of it allowed orbit
remains constant as long as it remains in the same orbit, An electron can not
revolve in an arbitrary orbit. Only those orbits are possible for which the
angular momentum of the electron about the nucleus is an integral multiple of
h/2p, The electron can move in all possible orbits, An atom radiates energy
only when an electron jumps from an allowed orbit of higher energy En to one of
the lower energy Ep)

11. According to Bohr’s theory of hydrogen atom, an electron can
revolve around a proton indefinitely if its path is __________.

(a perfect circle of any radius, a circle of constantly decreasing
radius, a circle of an allowed radius, an ellipse)

12. In a hydrogen atom the radius of the electron orbit is
governed by Bohr’s quantum rule which states that __________.

(the linear momentum of the electron is quantised, the angular
momentum of the electron is quantised, the linear velocity of the electron is
quantised, the angular velocity of the electron is quantised)

13. According to Bohr’s theory of the hydrogen atom, the total
energy of the hydrogen atom with its electron revolving in the nth stationary
orbit is __________.

(Acceleration of incident electrons by the nucleus of the target
atom, electron transitions between inner-shells of the target atom, electron
transitions between outer shells of the target atom, annihilation of the mass
of incident electrons)

(x-rays are not refracted as they pass from one medium to another,
like visible light, x-rays are diffracted at an obstacle, x-rays can cause
ionization of the atoms of a liquid, x-rays are deflected by electric and
magnetic fields)

31. x-rays were discovered by __________.

(Madam Curie, Rontgen, Coolidge, Laue)

32. X-rays are produced when an element of high atomic weight is
bombarded by high energy __________.

(Protons, Electrons, Neutrons, Photons)

33. __________ of the following parameters of the emitted x-rays
increases when the potential difference between the electrodes of an x-ray tube
is increased.

32. __________ of the following particles consists of fast moving
electrons.

(a-particle, b-particle, g-particle, all of these)

33. __________ of the following particles has less kinetic energy.

(a-particle, b-particle, g-particle, all of these)

34. __________ of the following particles move with velocity of
light.

(a-particle, b-particle, g-particle, all of these)

35. X-Rays are __________.

(Positively charged, negatively charged, neutral, none of these)

36. __________ rays or particles are not deflected by electric and
magnetic field.

(a-particle, b-particle, g-particle, all of these)

37. When g-rays are bombarded on metals, they emit __________.

(Protons from the metal surface, neutrons from the metal surface,
electrons from the metal surface, all of these)

38. The penetrating power of g-rays is about hundred times larger
than that of __________.

(Photons, a-rays, b-rays, electrons)

39. g-rays are electromagnetic radiations similar to __________.

(radiowaves, photons, x-rays, b-rays)

40. Unstable isotopes are called __________.

(Isobars, isomers, radioactive isotopes, none of these)

41. Isotopes differ only in the number of __________.

(electrons, protons, neutrons, none of these)

42. When a nucleus wmits an alpha radiation/particles its atomic
number drops by __________.

(1, 2, 3, 4)

43. When a nucleus emits an alpha radiation/particles its nucleon
number drops by __________.

(1, 2, 3, 4)

44. When an element emits b-particles, its mass numbers A
__________.

(increases by 1, decreases by 1, remains same, becomes zero)

45. When an element X emits gamma-rays, its atomic number Z
__________.

(Increases by 1, decreases by 1, remains same, none of these)

46. When an element X emits gamma rays, its mass number A
__________.

(increases by 1, decreases by 1, remains sme, none of these)

47. Out of the following __________ is not emitted by a
radioactive substance.

(electrons, electromagnetic radiations, helium nuclei with a
charge equal to that of two protons, neutrons)

48. The time required for the element to decay to one half of its
original number is called __________.

(Transmutation, half-life, nuclear decay, none of these)

49. It has been observed that, on the average, the actual number
of atoms which decay at any instant is __________.

(inversely proportional to the number of atoms present, directly
proportional to the number of atoms present, inversely proportional to the
square of the total number of atoms present, inversly proportional to the
square root of the total number of atoms present)

50. The half life of a radioactive substance is 10days. This means
that __________.

(the substance completely disintegates in 20 days, the substance
completely disintegrates in 40days, 1/8 part of the mass of the substance will
be left intact at the end of 40 days, 7/8 part of the mass of the substance
disintegrates in 30 days)

51. The half-life of a radioactive substance depends upon
__________.

(its temperature, the external pressure on it, the mass of the
substance, the strength of the nuclear force between the nucleons of its atoms)

52. __________ of the following conservation laws must be obeyed
in a nuclear reaction.

(the conservation of electric charge, the conservation of energy
and mass, the conservation of linear momentum, the conservation angular
momentum, all of these)

53. __________ of the following particles is considered as an
ideal projectile for induced nuclear reactions.

(Electrons, Proton, neutron, g-particle)

54. When mass m is converted into energy it release energy equal
to __________.

(mc2, mc3, m2c, mc)

55. The splitting of nuclei of a substance into two or more
fragments, with emission of energy, its called __________.

(Nuclear fission, Nuclear fusion, a-decay, None of these)

56. The process in which two smaller nuclei combine to corm a big
nucleus with release of energy is called __________.

(Nuclear fission, Nuclear fusion, a-decay, none of the above)

57. In a fission reaction each nucleus emits about __________.

(one to two neutrons, two to three neutrons, one to two electrons,
two to three electrons)

58. __________ give more energy.

(Nuclear Fission, Nuclear Fusion, Burning of Coal, None of these)

59. The sun which is largest source of heat energy gets its energy
by the process of __________.

62. A device which is used to extract nuclear energy with easier
means and with out any harm to environment and human beings and utilize the
energy for fruitful purposes in everyday life and work is __________.

(Cyclotron, Nuclear Reactor, Hydrogen bomb, Betatron)

63. Graphite and heavy water are two common moderators used in a
nuclear reactor. The function of the moderator is __________.

(to slow down the neutrons to thermal energies, to absorb the
neutrons nad stop the chain reaction, to cool the reactor, to control the
energy released in the reactor)

64. Cadmium rods are used in nuclear reactor for __________.

(slowing down fast neutrons, speeding up slow neutrons, absorbing
neutrons, regulating the power level of the reactor)

65. In Liquid Metal Fast Breeder Reactor we use __________.

(water as coolant, Sodium metal as coolant, graphite as coolant,
none of these)

66. __________ nuclear radiation detector is based on the
principles “that supersaturated vapours condense more readily on ions or dust
particles”.

8. __________ of the Newtonian laws don not hold in an accelerated
frame of reference.

(Newton’s first and second law of motion, Newton’s scond and third
law of motion, third law of motion, Newton’s first law of motion and law of
Gravitation)

9. __________ of the following statements is not correct.

(the law of physics are the same in all inertial frames, the speed
of light in free space has the same value in all inertial frames, two events
which occur simultaneously in one reference frame also must appear to occur
simultaneous in another reference frame, Einstein rejected Newton’s idea of
absolute time)

10. The simple assumption that all possible reference frames
moving with uniform velocity relative to one another are equivalent for the
statement of laws of physics is called the __________.

(All laws of physics are the same in every inertial reference
frame, Every motion is relative, Light has dual nature, Energy and mas are
interconvertable)

12. Special theory of relativity states that __________.

(Time is absolute, The speed of light in a vacuumm, measured in
all inertial reference frames always has the same value of c, no matter how
fast the source of light and the observer are moving relative to each other,
space is absolute, at rest mas of an object is always zero)

13. A body of some material capable of absorbing all heat
radiation incident on it and can emit in turn all the radiation at constant
temperature after it is in equilibrium with it is called __________.

(The scattered photon has frequency less than that of the incident
photon, the scattered photon has frequency greater than that of the incident
photon, the scattered photon has frequency equal to the incident photon, none
of these)

33. On moving from one place to another electromagnetic radiation
behaves as __________.